Mean Airway Pressure Calculator

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Volume control uses a constant-flow waveform (K = 0.5). Pressure control uses a rectangular waveform (K = 1). APRV uses a separate high/low pressure and time formula.
The highest airway pressure reached during each breath. Typical target is below 30 cmH₂O.
cmH₂O
Positive end-expiratory pressure - the pressure maintained in the airway at end-expiration. Typical range 4-8 cmH₂O.
cmH₂O
The number of breaths per minute delivered by the ventilator.
breaths/min
Duration of each inspiratory phase. With RR 16, the total cycle is 3.75 s; a 1:2 ratio gives Ti = 1.25 s.
s
1 mmHg = 1.36 cmH₂O. Clinical ventilators usually display cmH₂O.
Mean airway pressure (Paw)Below typical range
7.7

Time-averaged pressure across the full respiratory cycle

Paw unitcmH₂O
Total cycle time (Ttot)3.75
Ti : Ttot ratio0.267
I:E ratio1 : 2.8
Waveform constant (K)0.5
7.7 cmH₂O
Low<13.6Normal13.6-20.4Elevated20.4+

Paw is 7.7 cmH₂O in volume control mode.

  • Paw of 7.7 cmH₂O is below the typical 13.6-20.4 cmH₂O range. Alveolar recruitment may be suboptimal.
  • Ti:Ttot ratio of 26.7% - the inspiratory phase occupies 26.7% of each cycle.
  • Mean airway pressure correlates with alveolar pressure, oxygenation (OI = Paw x FiO2 / PaO2), and risk of barotrauma.

Next stepConfirm PIP, PEEP, and Ti settings on the ventilator. Use the oxygenation index (OI = Paw x FiO2 / PaO2 x 100) to assess gas exchange efficiency.

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